hc_sl811.c

S3C2440ARM9开发板的USB驱动程序

	jj = SL811Read (hci, SL11H_SOFTMRREG);
	kk = (jj & 0xFF) * 64 - ii;

	if (kk < 0) {
		DBGVERBOSE
		    ("hc_add_trans: no bandwidth for schedule, ii = 0x%x,"
		     "jj = 0x%x, len =0x%x, active_trans = 0x%x\n", ii, jj, len,
		     hci->active_trans);
		return (-1);
	}

	if (pid != PID_IN) {
		/* Load data into hc */

		SL811BufWrite (hci, SL11H_DATA_START, (__u8 *) data, len);
	}

	/* transmit */

	SL11StartXaction (hci, (__u8) address, (__u8) endpoint, (__u8) pid, len,
			  toggle, slow, urb_state);

	return len;
}

/************************************************************************
 * Function Name : hc_parse_trans
 *  
 * This function checks the status of the transmitted or received packet
 * and copy the data from the SL811HS register into a buffer.
 *
 * 1) Check the status of the packet 
 * 2) If successful, and IN packet then copy the data from the SL811HS register
 *    into a buffer
 *
 * Input:  hci = data structure for the host controller
 *         actbytes = pointer to actual number of bytes
 *         data = data buffer
 *         cc = packet status
 *         length = the urb transmit length
 *         pid = packet ID
 *         urb_state = the current stage of USB transaction
 *       
 * Return: 0 
 ***********************************************************************/
static inline int hc_parse_trans (hci_t * hci, int *actbytes, __u8 * data,
				  int *cc, int *toggle, int length, int pid,
				  int urb_state)
{
	__u8 addr;
	__u8 len;

	DBGFUNC ("enter hc_parse_trans\n");

	/* get packet status; convert ack rcvd to ack-not-rcvd */

	*cc = (int) SL811Read (hci, SL11H_PKTSTATREG);

	if (*cc &
	    (SL11H_STATMASK_ERROR | SL11H_STATMASK_TMOUT | SL11H_STATMASK_OVF |
	     SL11H_STATMASK_NAK | SL11H_STATMASK_STALL)) {
		if (*cc & SL11H_STATMASK_OVF)
			DBGERR ("parse trans: error recv ack, cc = 0x%x, TX_BASE_Len = "
				"0x%x, TX_count=0x%x\n", *cc,
				SL811Read (hci, SL11H_BUFLNTHREG),
				SL811Read (hci, SL11H_XFERCNTREG));

	} else {
		DBGVERBOSE ("parse trans: recv ack, cc = 0x%x, len = 0x%x, \n",
			    *cc, length);

		/* Successful data */
		if ((pid == PID_IN) && (urb_state != US_CTRL_SETUP)) {

			/* Find the base address */
			addr = SL811Read (hci, SL11H_BUFADDRREG);

			/* Find the Transmit Length */
			len = SL811Read (hci, SL11H_BUFLNTHREG);

			/* The actual data length = xmit length reg - xfer count reg */
			*actbytes = len - SL811Read (hci, SL11H_XFERCNTREG);

			if ((data != NULL) && (*actbytes > 0)) {
				SL811BufRead (hci, addr, data, *actbytes);

			} else if ((data == NULL) && (*actbytes <= 0)) {
				DBGERR ("hc_parse_trans: data = NULL or actbyte = 0x%x\n",
					*actbytes);
				return 0;
			}
		} else if (pid == PID_OUT) {
			*actbytes = length;
		} else {
			// printk ("ERR:parse_trans, pid != IN or OUT, pid = 0x%x\n", pid);
		}
		*toggle = !*toggle;
	}

	return 0;
}

/************************************************************************
 * Function Name : hc_start_int
 *  
 * This function enables SL811HS interrupts
 *
 * Input:  hci = data structure for the host controller
 *       
 * Return: none 
 ***********************************************************************/
static void hc_start_int (hci_t * hci)
{
#ifdef HC_SWITCH_INT
	int mask =
	    SL11H_INTMASK_XFERDONE | SL11H_INTMASK_SOFINTR |
	    SL11H_INTMASK_INSRMV | SL11H_INTMASK_USBRESET;
	SL811Write (hci, IntEna, mask);
#endif
}

/************************************************************************
 * Function Name : hc_stop_int
 *  
 * This function disables SL811HS interrupts
 *
 * Input:  hci = data structure for the host controller
 *       
 * Return: none 
 ***********************************************************************/
static void hc_stop_int (hci_t * hci)
{
#ifdef HC_SWITCH_INT
	SL811Write (hci, SL11H_INTSTATREG, 0xff);
//  SL811Write(hci, SL11H_INTENBLREG, SL11H_INTMASK_INSRMV);

#endif
}

/************************************************************************
 * Function Name : handleInsRmvIntr
 *  
 * This function handles the insertion or removal of device on  SL811HS. 
 * It resets the controller and updates the port status
 *
 * Input:  hci = data structure for the host controller
 *       
 * Return: none 
 ***********************************************************************/
void handleInsRmvIntr (hci_t * hci)
{
	hcipriv_t *hp = &hci->hp;

	USBReset (hci);

	/* Changes in connection status */

	hp->RHportStatus->portChange |= PORT_CONNECT_CHANGE;

	/* Port Enable or Disable */

	if (hp->RHportStatus->portStatus & PORT_CONNECT_STAT) {
		/* device is connected to the port:
		 *    1) Enable port 
		 *    2) Resume ?? 
		 */
//               hp->RHportStatus->portChange |= PORT_ENABLE_CHANGE;

		/* Over Current is not supported by the SL811 HW ?? */

		/* How about the Port Power ?? */

	} else {
		/* Device has disconnect:
		 *    1) Disable port
		 */

		hp->RHportStatus->portStatus &= ~(PORT_ENABLE_STAT);
		hp->RHportStatus->portChange |= PORT_ENABLE_CHANGE;

	}
}

/*****************************************************************
 *
 * Function Name: SL11StartXaction
 *  
 * This functions load the registers with appropriate value and 
 * transmit the packet.				  
 *
 * Input:  hci = data structure for the host controller
 *         addr = USB address of the device
 *         epaddr = endpoint number
 *         pid = packet ID
 *         len = data length
 *         toggle = USB toggle bit, either 0 or 1
 *         slow = speed of the device
 *         urb_state = the current stage of USB transaction
 *
 * Return: 0 = error; 1 = successful
 *                
 *****************************************************************/
int SL11StartXaction (hci_t * hci, __u8 addr, __u8 epaddr, int pid, int len,
		      int toggle, int slow, int urb_state)
{

	hcipriv_t *hp = &hci->hp;
	__u8 cmd = 0;
	__u8 setup_data[4];
	__u16 speed;

	speed = hp->RHportStatus->portStatus;
	if (!(speed & PORT_LOW_SPEED_DEV_ATTACH_STAT) && slow) {
		cmd |= SL11H_HCTLMASK_PREAMBLE;
	}
	switch (pid) {
	case PID_SETUP:
		cmd &= SL11H_HCTLMASK_PREAMBLE;
		cmd |=
		    (SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENBLEP |
		     SL11H_HCTLMASK_WRITE);
		break;

	case PID_OUT:
		cmd &= (SL11H_HCTLMASK_SEQ | SL11H_HCTLMASK_PREAMBLE);
		cmd |=
		    (SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENBLEP |
		     SL11H_HCTLMASK_WRITE);
		if (toggle) {
			cmd |= SL11H_HCTLMASK_SEQ;
		}
		break;

	case PID_IN:
		cmd &= (SL11H_HCTLMASK_SEQ | SL11H_HCTLMASK_PREAMBLE);
		cmd |= (SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENBLEP);
		break;

	default:
		DBGERR ("ERR: SL11StartXaction: unknow pid = 0x%x\n", pid);
		return 0;
	}
	setup_data[0] = SL11H_DATA_START;
	setup_data[1] = len;
	setup_data[2] = (((pid & 0x0F) << 4) | (epaddr & 0xF));
	setup_data[3] = addr & 0x7F;

	SL811BufWrite (hci, SL11H_BUFADDRREG, (__u8 *) & setup_data[0], 4);

	SL811Write (hci, SL11H_HOSTCTLREG, cmd);

#if 0
	/* The SL811 has a hardware flaw when hub devices sends out
	 * SE0 between packets. It has been found in a TI chipset and
	 * cypress hub chipset. It causes the SL811 to hang
	 * The workaround is to re-issue the preample again.
	 */

	if ((cmd & SL11H_HCTLMASK_PREAMBLE)) {
		SL811Write (hci, SL11H_PIDEPREG_B, 0xc0);
		SL811Write (hci, SL11H_HOSTCTLREG_B, 0x1);	// send the premable
	}
#endif
	return 1;
}

/*****************************************************************
 *
 * Function Name: hc_interrupt
 *
 * Interrupt service routine. 
 *
 * 1) determine the causes of interrupt
 * 2) clears all interrupts
 * 3) calls appropriate function to service the interrupt
 *
 * Input:  irq = interrupt line associated with the controller 
 *         hci = data structure for the host controller
 *         r = holds the snapshot of the processor's context before 
 *             the processor entered interrupt code. (not used here) 
 *
 * Return value  : None.
 *                
 *****************************************************************/
static void hc_interrupt (int irq, void *__hci, struct pt_regs *r)
{
	char ii;
	hci_t *hci = __hci;
	int isExcessNak = 0;
	int urb_state = 0;
	char tmpIrq = 0;

	/* Get value from interrupt status register */

	ii = SL811Read (hci, SL11H_INTSTATREG);

	if (ii & SL11H_INTMASK_INSRMV) {
		/* Device insertion or removal detected for the USB port */

		SL811Write (hci, SL11H_INTENBLREG, 0);
		SL811Write (hci, SL11H_CTLREG1, 0);
		mdelay (100);	// wait for device stable 
		handleInsRmvIntr (hci);
		return;
	}

	/* Clear all interrupts */

	SL811Write (hci, SL11H_INTSTATREG, 0xff);

	if (ii & SL11H_INTMASK_XFERDONE) {
		/* USB Done interrupt occurred */

		urb_state = sh_done_list (hci, &isExcessNak);
#ifdef WARNING
		if (hci->td_array->len > 0)
			printk ("WARNING: IRQ, td_array->len = 0x%x, s/b:0\n",
				hci->td_array->len);
#endif
		if (hci->td_array->len == 0 && !isExcessNak
		    && !(ii & SL11H_INTMASK_SOFINTR) && (urb_state == 0)) {
			if (urb_state == 0) {
				/* All urb_state has not been finished yet! 
				 * continue with the current urb transaction 
				 */

				if (hci->last_packet_nak == 0) {
					if (!usb_pipecontrol
					    (hci->td_array->td[0].urb->pipe))
						sh_add_packet (hci, hci->td_array-> td[0].urb);
				}
			} else {
				/* The last transaction has completed:
				 * schedule the next transaction 
				 */

				sh_schedule_trans (hci, 0);
			}
		}
		SL811Write (hci, SL11H_INTSTATREG, 0xff);
		return;
	}

	if (ii & SL11H_INTMASK_SOFINTR) {
		hci->frame_number = (hci->frame_number + 1) % 2048;
		if (hci->td_array->len == 0)
			sh_schedule_trans (hci, 1);
		else {
			if (sofWaitCnt++ > 100) {
				/* The last transaction has not completed.
				 * Need to retire the current td, and let
				 * it transmit again later on.
				 * (THIS NEEDS TO BE WORK ON MORE, IT SHOULD NEVER 
				 *  GET TO THIS POINT)
				 */

				DBGERR ("SOF interrupt: td_array->len = 0x%x, s/b: 0\n",
					hci->td_array->len);
				urb_print (hci->td_array->td[hci->td_array->len - 1].urb,
					   "INTERRUPT", 0);
				sh_done_list (hci, &isExcessNak);
				SL811Write (hci, SL11H_INTSTATREG, 0xff);
				hci->td_array->len = 0;
				sofWaitCnt = 0;
			}
		}
		tmpIrq = SL811Read (hci, SL11H_INTSTATREG) & SL811Read (hci, SL11H_INTENBLREG);
		if (tmpIrq) {
			DBG ("IRQ occurred while service SOF: irq = 0x%x\n",
			     tmpIrq);

			/* If we receive a DONE IRQ after schedule, need to 
			 * handle DONE IRQ again 
			 */

			if (tmpIrq & SL11H_INTMASK_XFERDONE) {
				DBGERR ("IRQ occurred while service SOF: irq = 0x%x\n",
					tmpIrq);
				urb_state = sh_done_list (hci, &isExcessNak);
			}
			SL811Write (hci, SL11H_INTSTATREG, 0xff);
		}
	} else {
		DBG ("SL811 ISR: unknown, int = 0x%x \n", ii);
	}

	SL811Write (hci, SL11H_INTSTATREG, 0xff);
	return;
}

/*****************************************************************
 *
 * Function Name: hc_reset
 *
 * This function does register test and resets the SL811HS 
 * controller.
 *
 * Input:  hci = data structure for the host controller
 *
 * Return value  : 0
 *                
 *****************************************************************/
static int hc_reset (hci_t * hci)
{
	int attachFlag = 0;

	DBGFUNC ("Enter hc_reset\n");
	regTest (hci);
	attachFlag = USBReset (hci);
	if (attachFlag) {
		setPortChange (hci, PORT_CONNECT_CHANGE);
	}
	return (0);
}

/*****************************************************************
 *
 * Function Name: hc_alloc_trans_buffer
 *
 * This function allocates all transfer buffer  
 *
 * Input:  hci = data structure for the host controller
 *
 * Return value  : 0
 *                
 *****************************************************************/
static int hc_alloc_trans_buffer (hci_t * hci)
{
	hcipriv_t *hp = &hci->hp;
	int maxlen;

	hp->itl0_len = 0;
	hp->itl1_len = 0;
	hp->atl_len = 0;

	hp->itl_buffer_len = 1024;
	hp->atl_buffer_len = 4096 - 2 * hp->itl_buffer_len;	/* 2048 */

	maxlen = (hp->itl_buffer_len > hp->atl_buffer_len) ? hp->itl_buffer_len : hp->atl_buffer_len;

	hp->tl = kmalloc (maxlen, GFP_KERNEL);

	if (!hp->tl)
		return -ENOMEM;

	memset (hp->tl, 0, maxlen);
	return 0;
}

/*****************************************************************
 *
 * Function Name: getPortStatusAndChange
 *